<template>
<div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
   <el-card>
       <!-- 头部警告区域 -->
        <el-alert
    title="注意:只允许为第三级分类设置相关参数"
    type="warning" :closable="false" show-icon>
  </el-alert>
  <!-- 选择商品分类区域 -->
  <el-row class="cat_opt">
      <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
              <el-cascader
       v-model="selectedCateKeys"
      :options="cateList"
      :props="cateProps"
      @change="handleChange"></el-cascader>

      </el-col>
  </el-row>
  <!-- tab页签区域 -->
     <el-tabs v-model="activeName" @tab-click="handleTabClick">
         <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <el-button type="primary" :disabled='isBtnDisabled' size="mini" @click="addDialogVisible = true">添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                   <el-tag v-for="(item, i) in scope.row.attr_vals" :key='i' closable="" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                   <!-- 输入的文本框 -->
                   <el-input
                class="input-new-tag"
                v-if=" scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
>
        <!-- 添加按钮· -->
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
            </el-table-column>
          <el-table-column type="index"></el-table-column>
          <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作" >
              <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
          </el-table-column>
        </el-table>
    </el-tab-pane>
    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only">
        <el-button type='primary' :disabled='isBtnDisabled' size="mini"  @click="addDialogVisible = true">添加属性</el-button>
         <!-- 静态参数表格 -->
        <el-table :data="onlyTableData" border stripe>
               <el-table-column type="expand">
                <template slot-scope="scope">
                   <el-tag v-for="(item, i) in scope.row.attr_vals" :key='i' closable="" @close="handleClose(i,scope.row)">{{item}}</el-tag>
                   <!-- 输入的文本框 -->
                   <el-input
                class="input-new-tag"
                v-if=" scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
>
        <!-- 添加按钮· -->
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
            </el-table-column>
          <el-table-column type="index"></el-table-column>
          <el-table-column label="参数名称" prop="attr_name"></el-table-column>
          <el-table-column label="操作" >
              <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
          </el-table-column>
        </el-table>
    </el-tab-pane>
  </el-tabs>
   </el-card>
   <!-- 添加参数的对话框 -->
         <el-dialog
            :title=" '添加' + titleText "
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed"
            >
                <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
                </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false" >取 消</el-button>
                <el-button type="primary" @click='addParams'>确 定</el-button>
            </span>
            </el-dialog>
            <!-- 修改参数的对话框 -->
         <el-dialog
            :title=" '修改' + titleText "
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClosed"
            >
                <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
                </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false" >取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
            </el-dialog>
</div>
</template>
<script>
export default {
    data() {
        return {
            cateList: [],
            // 级联选择框的配置选项
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
            expandTrigger: 'hover'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签名称
            activeName: 'many',
            // 动态表格的数据
            manyTableData: [],
            // 静态表格的数据
            onlyTableData: [],
            // 控制添加参数对框框的显示
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {},
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 控制修改参数对话框的显示
            editDialogVisible: false,
            // 修改参数对话框的表单数据对象
            editForm: {},
            // 修改参数对话框的表单验证规则
            editFormRules: {
                 attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 控制文本框与按钮的切换显示
            inputVisible: false,
            // 文本框中输入的内容
            inputValue: ''
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
    //  获取商品分类列表
   async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
             return this.$message.error('获取商品分类列表失败')
        }
        this.cateList = res.data
    },
    // 级联选择框选中项变化，会触发这个函数
     handleChange() {
      this.getParamsData()
    },
      handleTabClick() {
     this.getParamsData()
      },
       // 获取参数的列表数据
    async getParamsData() {
         // 证明选中的不是三级分类
    if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
    }
    // 证明选中的是三级分类
    console.log(this.selectedCateKeys)
    // 根据所选分类的Id,和当前所处的面板，获取对应的参数
       const { data: res } = await this.$http.get(`categories/ ${this.cateId} /attributes`, { params: { sel: this.activeName } })
       if (res.meta.status !== 200) {
           return this.$message.error('获取参数列表失败')
       }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
        })
      console.log(res.data)
       if (this.activeName === 'many') {
           this.manyTableData = res.data
       } else {
           this.onlyTableData = res.data
       }
    },
    // 监听添加对话框的关闭事件,对话框关闭，重置表单
      addDialogClosed() {
          this.$refs.addFormRef.resetFields()
      },
    //   点击按钮，添加参数
         addParams() {
       this.$refs.addFormRef.validate(async valid => {
           if (!valid) return
            const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
           { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
           if (res.meta.status !== 201) {
               return this.$message.error('添加参数失败')
           }
           this.$message.success('添加参数成功')
           this.addDialogVisible = false
           this.getParamsData()
       })
       },
    // 点击编辑按钮，弹出修改参数对话框
      async showEditDialog (attr_id) {
          const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
              params: { attr_sel: this.activeName }
          })
          if (res.meta.status !== 200) {
              return this.$message.error('获取参数信息失败')
          }
          this.editForm = res.data
      this.editDialogVisible = true
      },
      // 监听添加对话框的关闭事件,对话框关闭，重置表单
      editDialogClosed() {
          this.$refs.editFormRef.resetFields()
      },
    //   点击按钮，修改参数信息
     editParams() {
         this.$refs.editFormRef.validate(async valid => {
             if (!valid) return
             const { data: res } = await this.$http.put(`categories/${this.cateId
             }/attributes/${this.editForm.attr_id}`, {
 attr_name: this.editForm.attr_name,
             attr_sel: this.activeName
})
             if (res.meta.status !== 200) {
                 return this.$message.error('修改参数失败')
             }
             this.$message.success('修改参数成功！')
             this.getParamsData()
             this.editDialogVisible = false
         })
     },
    //  根据id删除对应的参数项
     async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除操作
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除！')
            }
            // 删除业务逻辑
           const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败')
            }
             this.$message.success('删除参数成功！')
             this.getParamsData()
    },
    // 文本框失去焦点或者按下Enter都会触发
   async handleInputConfirm(row) {
        console.log('ok')
        row.inputVisible = false
        if (row.inputValue.trim().length === 0) {
            row.inputValue = ''
            row.inputVisible = false
        }
        // 如果没有return，则证明输入的内容，则需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputVisible = false
        // 需要发起请求，保存这次操作
        this.saveAttrVals(row)
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrVals(row) {
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
            return this.$message.error('修改参数项失败')
        }
        this.$message.success('修改参数项成功')
    },
    // 点击按钮，展示文本输入框
      showInput(row) {
          row.inputVisible = true
        // 让文本框自动获得焦点
        // $nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
         this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
     },
     handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
     }

   },
    computed: {
        // 如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
            return true
        }
        return false
        },
        // 当前选中的三级分类的ID
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            } else {
                return '静态属性'
            }
        }
    }
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin:15px 0px;
}
.el-tag {
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>
